Added new Dota 2 and Steam detection method. Fixed bug when Steam is detected with registry.

Added notification if Dota2 or Steam is not installed and exit
application if not installed.
Added Mod Manager, about form, several bug fixes.
Merge branch 'master' of https://github.com/ilian000/D2ModdinClient

Conflicts:
	d2mpclient/D2MP.cs
Added progress bar while downloading mods
Merge pull request #30 from ilian000/master

Added Mod Manager, about form, several bug fixes.